US3842098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2-mercaptobenzimidazole by reacting o-phenylene diamine and carbon disulfide
Assignee: Bayer AG
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Filing: 1973-01-12
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Granted: 1974-10-15
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Expires: 1993-01-12
Abstract
Abstract 1. A PROCESS FOR PRODUCING HIGH PURITY 2-MERCAPTOBENZIMIDAZOLE WHICH COMPRISES REACTING O-PHENYLENE DIAMIE WITH CARBON DISULFIDE IN BENZOTHIAZOLE OR IN ALKYLBENZOTHIAZOLE HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL MOIETY, EXTRACTING RESULTING 2-MERCAPTOBENZIMIDAZOLE CONTAINING SOLUTION WIWITH DILUTE AQUEOUS ALKALI METAL HYDROXIDE SOLUTION, PRECIPITATING EXTRACTED 2-MERCAPTOBENZIMIDTHIAZOLE FROM RESULTING AQUEOUS ALKALI METAL HYDROXIDE SOLUTION CONTAINING THE SAME BY ACIDIFICATION AND RECOVERING PRECIPITATED 2-MERCAPTOBENZIMIDAZOLE.
Inventors
- 👤 B Scherhag
- 👤 H Wolz
- 👤 M Francque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:09
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/24; C07D235/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR PRODUCING HIGH PURITY 2-MERCAPTOBENZIMIDAZOLE WHICH COMPRISES REACTING O-PHENYLENE DIAMIE WITH CARBON DISULFIDE IN BENZOTHIAZOLE OR IN ALKYLBENZOTHIAZOLE HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL MOIETY, EXTRACTING RESULTING 2-MERCAPTOBENZIMIDAZOLE CONTAINING SOLUTION WIWITH DILUTE AQUEOUS ALKALI METAL HYDROXIDE SOLUTION, PRECIPITATING EXTRACTED 2-MERCAPTOBENZIMIDTHIAZOLE FROM RESULTING AQUEOUS ALKALI METAL HYDROXIDE SOLUTION CONTAINING THE SAME BY ACIDIFICATION AND RECOVERING PRECIPITATED 2-MERCAPTOBENZIMIDAZOLE.
Claim 2
Dependent Claim
62 words
A PROCESS FOR PRODUCING HIGH PURITY 2-MERCAPTOBENZIMIDAZOLE WHICH COMPRISES REACTING O-PHENYLENE DIAMIE WITH CARBON DISULFIDE IN BENZOTHIAZOLE OR IN ALKYLBENZOTHIAZOLE HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL MOIETY, EXTRACTING RESULTING 2-MERCAPTOBENZIMIDAZOLE CONTAINING SOLUTION WIWITH DILUTE AQUEOUS ALKALI METAL HYDROXIDE SOLUTION, PRECIPITATING EXTRACTED 2-MERCAPTOBENZIMIDTHIAZOLE FROM RESULTING AQUEOUS ALKALI METAL HYDROXIDE SOLUTION CONTAINING THE SAME BY ACIDIFICATION AND RECOVERING PRECIPITATED 2-MERCAPTOBENZIMIDAZOLE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |